Photovoltaic Characteristics of Phthalocyanine-Polysilane Composite Films

Abstract

Poly[p-(methylphenylsilanylene)anthrylene] (PMPSA) which introduced anthracene into the Si–Si backbone structure of poly(methylphenylsilanylene) (PMPS) was synthesized. Schottky barrier photovoltaic cells consisting of semitransparent aluminum and phthalocyanine (H 2 Pc) dispersed in PMPSA were fabricated (H 2 Pc-PMPSA). The effects of a binder polymer and annealing of PMPSA on the photovoltaic characteristics were investigated. Since the conductivity of H 2 Pc-PMPSA composite films increases by the introduction of anthracene and the annealing, the photovoltaic property of H 2 Pc-PMPSA improves markedly. It is found that the power conversion efficiency becomes a maximum for H 2 Pc-PMPSA with a copolymerization ratio (1:1) at the annealing temperature of 160°C for 2 h. The photovoltaic parameters have the following values: the power conversion efficiency η is 4.42%, the fill factor F.F. is 0.30, the open circuit voltage V oc is 0.84 V and the short circuit photocurrent J sc is 0.71 µA/cm 2 . Furthermore, the carrier transport mechanisms of H 2 Pc-PMPSA composite films are discussed.